Polymorphism in the number of genes encoding long-wavelength-sensitive cone pigments among males with normal color vision

Vision Res. 1995 Sep;35(17):2395-407.

Abstract

Examination by direct DNA sequence analysis of the X-linked visual pigment genes in 27 males with normal color vision reveals that almost half have two or more different genes encoding a long-wavelength-sensitive cone pigment. This is counter to the conventional theory proposed from results of Southern hybridization studies that there is a single long-wave pigment gene per X-chromosome. Further, the sequences and consideration of the structure of the X-linked pigment gene array suggest that the majority of the observers (as many as 2/3) have hybrid (or fusion) genes like those that have been proposed to underlie color anomaly. In some observers the long-wave hybrid genes contain a substantial amount of middle-wave sequence, e.g. five observers have hybrid long-wave genes that contain middle-wave sequences that include exon 4. Three of those five have the hybrid as their only long-wave gene, and thus have no other gene that could potentially encode a long-wave pigment. In these subjects, it is the hybrid gene that produces their normal long-wavelength-sensitive cone pigment. The high frequency of hybrid genes indicates that they are normal variant forms of the long-wave gene. Contrary to what is commonly believed, the introduction and the expression of hybrid genes is not sufficient to cause color vision defects.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Base Sequence
  • Color Perception / genetics*
  • DNA / analysis
  • Exons / genetics
  • Gene Amplification
  • Gene Expression
  • Humans
  • Male
  • Molecular Sequence Data
  • Polymerase Chain Reaction
  • Polymorphism, Genetic*
  • Restriction Mapping
  • Retinal Cone Photoreceptor Cells / metabolism*
  • Retinal Pigments / biosynthesis
  • Retinal Pigments / genetics*
  • X Chromosome

Substances

  • Retinal Pigments
  • DNA